Belvidere is a town and the county seat of Warren County, in the U.S. state of New Jersey. As of the 2020 United States census, the town's population was 2,520, a decrease of 161 from the 2010 census count of 2,681, which in turn reflected a decline of 90 from the 2,771 counted in the 2000 census. Belvidere was incorporated as a town by an act of the New Jersey Legislature on April 7, 1845, from portions of Oxford Township, based on the results of a referendum held that day.
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